Propose: Costs are a major issue in low-cost housing projects. Traditional project process uses estimated cost studies and comparative methods in initial phases, but the cost itself is elaborated only at the end phases, generating significant re-working and changes in specifications and drawings. Is desirable to use tools that possibility more integration between costs and architectural projects. Some CAD software already offers these tools, but they are not use by architects. This work intention is search in these tools the integration between costs and architectural projects. Methods: To use software Vectorworks in a low-cost housing project, Residential Serra Verde; incorporate cost aspects at initial phase by parameterization of 3D model; analysis of cost and project results. Findings: validation of cost estimative with the utilization of tested procedures. Value: developing a simple methodology of cost estimation and integration with architectural project.